96results about How to "Reduce resonance effect" patented technology

This invention provides a polarized component with double-metal layer gratings. Multiple parallel dielectric layers having a period are formed on a transparent base, a groove is set between adjacent dielectric layers, a first metal layer having a first thickness is formed on the groove, a second metal layer with a second thickness and a width formed on the dielectric layer, in which, a vertical distance of 10~100um is between the first and second metal layers to isolate them. The period is 10~250nm, the thickness is 30~150nm, the first is equal to the second. The proportion of width/period is 25~75%. This invention also discloses the manufacturing method.

The invention discloses a low-cost, low-power consumption and high-performance automatic Q value adjustment amplitude limiting circuit, which comprises a rectification filter unit, a voltage detection unit and a drain unit, wherein the rectification filter circuit samples antenna voltage, and performs shaping processing to form sampled voltage VLM; the voltage detection unit compares the sampled voltage VLM with set internal reference voltage to obtain a drain control signal VC1; and the drain unit controls the current of a low-impedance path from an antenna to the ground according to the drain control signal VC1. The rectification filter unit of the circuit samples the voltage at the two ends of the antenna by utilizing a sampling diode and a sampling capacitor, the introduction of the sampling diode is favorable for reducing the influence of the amplitude limiting circuit on antenna resonance, and the adoption of the sampling capacitor greatly reduces pulse noises produced when the amplitude limiting circuit works; and a voltage division diode of the voltage detection unit adopts a diode connection method for P-channel metal oxide semiconductor (PMOS) transistors, and by the method, a territory area can be reduced and the influence of bulk effects on the circuit can be eliminated.

The invention relates to a sound insulation structure with a perforated plate. The sound insulation structure with perforated panels is mainly composed of an upper panel, a lower panel, a perforated panel and side panels. The peripheries of the space clamped between the perforated plate, the upper panel and the lower panel are blocked by side panels to form two chambers. The two chambers respectively form a resonance sound-absorbing structure with the perforated plate. In the sound insulation structure with perforated panels of the present invention, the upper panel, the lower panel and the side panels are all made of blind panels without perforations. The distance between the perforated plate and the upper and lower panels can be equal or different.

A driving mechanism comprises: (i) an actuator comprising: an electro-mechanical conversion element; a driving member which is connected to one end of the electro-mechanical conversion element and moves according to elongation or contraction of the electro-mechanical conversion element; and a weight member provided on the other end of the electro-mechanical conversion element; (ii) a driven member frictionally engaged with the driving member; and (iii) a driving circuit that drives the actuator, wherein the actuator allows the driven member to move along the driving member, and the driving circuit drives the electro-mechanical conversion element at a driving frequency f which gives f≧2^1/2·f₀ when resonance frequency of a 1-freedom system is f₀ in which the electro-mechanical conversion element and the driving member are designated as a mass and the weight member is designated as a spring, and driving frequency of the electro-mechanical conversion element is f.

The invention discloses a lever lateral mobile damping four-wheeler manned lunar rover folding system and belongs to the field of spaceflight. The system solves the problem that a four-wheeler is easily overturned integrally, difficultly climbs, runs into hollow surfaces, works cumbersomely, is high in energy consumption, low in adaptability and occupies a large space to hinder the implementation of exploration tasks and the like under the complicated geographical conditions on the surface of a star in the prior art. One side of a first rover body (1-1) is welded with two right-angled steel channels (6); the other side of the first rover body (1-1) is in folding connection with one side of a second rover body (1-2) through two middle connection folding mechanisms (8); the other side of the second rover body (1-2) is welding with two right-angled steel channels (6); the first rover body (1-1) is detachably connected with the second rover body (1-2) through a pair of rolling shaft pins (9) and pin slots (15); the lower end face of a bearing plate rover (1) is uniformly provided with four dual-wheel moving mechanisms. The system is used for a manned lunar rover.

Embodiments herein relate to a drive system for an electric motor. The drive system including a DC bus having a positive terminal and a ground terminal, an inverter connected to the DC bus configured to provide a plurality of motor excitation signals, and an interface cable operably connected to the inverter, and configured to transmit the plurality of motor excitation signals. The drive system also includes a motor remote from and connected to the inverter via the interface cable, the motor responsive to the motor excitation signals and a plurality of snubber circuits, each of the snubber circuits having a first terminal connected to a winding of the motor, and a second terminal operably connected to a first end of a transmission line and a second end of the transmission line is connected to the positive terminal of the DC Bus.

In accordance with one aspect of the present invention, a cantilever of a probe-based instrument is deflected by directing a beam of ultrasonic acoustic energy at the cantilever to apply acoustic radiation pressure to the cantilever. The energy is generated by an acoustic actuator. The transmitted beam preferably is focused using a cylindrical lens, providing a beam tightly focused in one dimension and unfocused in a second dimension. In accordance with another aspect of the present invention, a power source such as an RF signal generator is operated so as to spread the spectrum of acoustic radiation on a time scale that is short or comparable to the acoustic roundtrip time. Such a design diminishing the resonance effects and sensitivity to spacing between the cantilever and the acoustic source.

A speaker box includes a housing with an accommodating space and a housing wall; a propping wall extending from the housing wall toward the accommodating space; and a speaker unit located between the housing wall and the propping wall for dividing the accommodating space into a front cavity and a back cavity. The speaker unit includes a diaphragm located in the front cavity for forming a front sound cavity cooperatively with the housing, a sound guiding channel communicating the front sound cavity with outside, and a through hole penetrating the propping wall and communicating the sound guiding channel with the back cavity. The speaker box further includes an elastic cover plate covering the through hole completely for absorbing vibration energy at a specific frequency. The Young's modulus or strength of the elastic cover plate is smaller than that of the propping wall.

The invention relates to a frame-hiding three-glass energy-saving sound insulating window and a manufacture method thereof. The sound insulating window is characterized by comprising a flat opening window sash (1) consisting of a hollow glass inner layer and a single glass outer layer, a fixed window sash (2) and a window outer frame (3), wherein a muntin (11) needs to be arranged between the flat opening window sash (1) and the fixed window sash (2) according to design style; the hollow glass (4) is fixedly connected with the flat opening window sash (1) by a seal adhesive tape (5) and a flat opening window sash press strip (6); the single glass (7) is fixedly connected with the outer side of the flat opening window sash (1) by a double-side adhesive tape (8) and silicone structure adhesive (9); the top surface of the window outer frame (3) is in flexible embedded seal connection with a wall body (10) by a polyurethane foaming agent; and the top surface of the flat opening window sash (1) is connected with a window frame by a stainless steel sliding support (12). The invention has the advantages of firm and durable structure, tensile resistance, high shearing strength, stable quality, high noise reducing and sound insulating performance, air tightness, high watertight performance, high heat preserving performance and attractive appearance.

Inside a multilayer dielectric substrate (1), there are a spiral-shaped first slot (4) set in a part of a first ground conductor layer (2) and a spiral-shaped second slot (5) in a part of a second ground conductor layer (3) put on the front surface of the multilayer dielectric substrate, the first slot and the second slot are opposite in a spiral winding direction and the first slot and the second slot overlap with each other as viewed from the top face, so that a resonance phenomenon can be produced at a frequency lower than a resonance frequency of a resonator with a conventional structure.

The invention discloses a wiring structure for improving wiring response, mainly eliminating bad electric coupling between inner-layer planes of a printed circuit board (PCB) to improve the wiring response. The wiring structure makes the wiring able to use a grounding plane as a reference plane and comprises: at least a wiring plane to arrange many signal wires on; and one or many power supply plane, arranged in a PCB and provided with at least an arbitrary shaped etched hole corresponding to the signal wires. And it uses the etching technique to remove the corresponding sections of the power supply planes above or below the signal wires so as to make them able to obtain relatively accurate potentials using the grounding plane as a potential reference, thus reducing the negative influence of stray capacitance between the planes. Further, because of the reduction of the stray capacitance, it can eliminate the resonance effect and parasitic vibration produced as the PCB is at high frequency, so as to improve the circuit quality of the whole PCB.

A key structure with reduced resonant noise includes a base plate formed with a first supporting portion and a second supporting portion, a conductive film layer, an elastic conducting element, a linking rod, and a keycap on the linking rod. The linking rod has a main portion, a first arm extended from one end of the main portion and pivotally connected to the first supporting portion, and a second arm extended from the other end of the main portion and pivotally connected to the second supporting portion. The key cap has a bottom surface pivotally connected to the main portion of the linking rod. The base plate has openings under the linking rod and adjacent to the first supporting portion and the second supporting portion. The openings can reduce resonant effect of clapping sound in the keycap, when the keycap is pressed.

The invention discloses a patch-type anti-vibration capacitor which comprises a mounting mouth, a plate frame and a coiled strip, wherein the mounting mouth is arranged on the center of the plate frame; more than two rounds of coiled strip are disposed on the plate frame; the coiled strip is composed of a PCB strip and more than two capacitor bodies; the capacitor bodies are arranged in a straight line on the PCB strip; the PCB strip is gradually wound around the plate frame; and each capacitor body is provided with a capacitor, a top column, a support frame, an elastic strip and a placing disc. The influence of resonance on the capacitor is mainly reduced by the top column and the elastic strip. The connection relationship between the capacitor and the support frame is enhanced by the top column. The capacitor ensures that a mounting base does not horizontally shift, is completely prevented from detachment, and cannot cause a short circuit. A mesh-like planar structure formed by a triangular stabilizer can easily dissipate the heat generated during the operation of the capacitor, thereby improving the heat resistance.